68Chev
Newbie
89 Chevy K2500 4x4, 350 TBI, TH400 transmission. 250K miles
Have had progressive issue with motor stalling and dying. Started several yrs ago, intermittently (2 or 3 times yearly) would stall and die as I approached stop light and motor idled down. Would restart fine early on, then started having trouble starting after stalling at light, but would re-start after 1 or 2 attempts.
Issue progressed to misfiring, stalling and dying after warm up. Would also run same at cold start occasionally. Now stalls and dies after warmup, 5-10 minutes at idle.
Have r/r'd numerous parts and corrected several issues. Replaced following components: Distributor, ign coil, temp sensor, oil press sensor, oil pressure gauge sensor, MAP sensor(except MAP filter), TPS, IAC, knock sensor, O2 sensor, spark plugs/wires, EGR valve, PCV valve, fuel pump fuse at firewall. One fuel injector replaced, other tested and flow matched at shop. All vacuum lines checked. Checked fuses at fuse box.
Replaced fuel pump and filter. Had minor leak at fuel pump and ground wire was broken at connector at top of pump. Tested fuel pressure at TB after fuel pump r/r, checks at 12 psi.
Inspected battery, all motor grounds (cleaned and replaced several grounds but most looked healthy).
Rebuilt throttle body, replaced fuel metering valve, and had throttle shaft line-bored and re-bushed by shop. Throttle shaft had some play.
During t/shooting and parts r/r, issue has changed some. After stalling and dying, with key still on, pass side injector will begin to click intermittently. Swapped injectors from one side to other, both injectors now have same intermittent clicking, but left side injector occurs most often. OBD scan with jumper clip at port reads code 43 consistently now. Peeled back wiring harness from firewall to distributor and to injectors. No obvious issues, all wiring well insulated and connectors looked solid/clean. Have moved all connections and wiring harnesses to try to induce stall or injector clicking, no joy. Pulled ECM, inspected wire harness from ECM to f/wall, no obvious issues.
After all this, two consistent issues are repeating now.
1. Fuel injector clicking intermittently after stall, with key on.
2. During OBD scan, if I allow system to run through loop, injector will begin to click intermittently and CEL will flicker, interrupting scan process.
Any advice/help is appreciated.
Have had progressive issue with motor stalling and dying. Started several yrs ago, intermittently (2 or 3 times yearly) would stall and die as I approached stop light and motor idled down. Would restart fine early on, then started having trouble starting after stalling at light, but would re-start after 1 or 2 attempts.
Issue progressed to misfiring, stalling and dying after warm up. Would also run same at cold start occasionally. Now stalls and dies after warmup, 5-10 minutes at idle.
Have r/r'd numerous parts and corrected several issues. Replaced following components: Distributor, ign coil, temp sensor, oil press sensor, oil pressure gauge sensor, MAP sensor(except MAP filter), TPS, IAC, knock sensor, O2 sensor, spark plugs/wires, EGR valve, PCV valve, fuel pump fuse at firewall. One fuel injector replaced, other tested and flow matched at shop. All vacuum lines checked. Checked fuses at fuse box.
Replaced fuel pump and filter. Had minor leak at fuel pump and ground wire was broken at connector at top of pump. Tested fuel pressure at TB after fuel pump r/r, checks at 12 psi.
Inspected battery, all motor grounds (cleaned and replaced several grounds but most looked healthy).
Rebuilt throttle body, replaced fuel metering valve, and had throttle shaft line-bored and re-bushed by shop. Throttle shaft had some play.
During t/shooting and parts r/r, issue has changed some. After stalling and dying, with key still on, pass side injector will begin to click intermittently. Swapped injectors from one side to other, both injectors now have same intermittent clicking, but left side injector occurs most often. OBD scan with jumper clip at port reads code 43 consistently now. Peeled back wiring harness from firewall to distributor and to injectors. No obvious issues, all wiring well insulated and connectors looked solid/clean. Have moved all connections and wiring harnesses to try to induce stall or injector clicking, no joy. Pulled ECM, inspected wire harness from ECM to f/wall, no obvious issues.
After all this, two consistent issues are repeating now.
1. Fuel injector clicking intermittently after stall, with key on.
2. During OBD scan, if I allow system to run through loop, injector will begin to click intermittently and CEL will flicker, interrupting scan process.
Any advice/help is appreciated.